1 error: you seem to be trying to use `Box<Vec<T>>`. Consider using just `Vec<T>`
2 --> $DIR/box_vec.rs:17:18
4 17 | pub fn test(foo: Box<Vec<bool>>) {
7 = note: `-D box-vec` implied by `-D warnings`
8 = help: `Vec<T>` is already on the heap, `Box<Vec<T>>` makes an extra allocation.
10 error: aborting due to previous error